Macbook Ram Speed Question (1033 or 1333 MHZ)

Mid 2010 MBPs (7,1) with Geforce 320M are known for freezing when using faster ram. Motherboard chipset supports it, but graphics chip doesn't and OSX freezes when initializes the graphics.

My recommendation - buy 1066MHz DDR3. If you can't find it in your local store, try OWC, it's a reputable online store that guarantees compatible ram at good prices.

ps. I'm not in any way connected with OWC.

How many beeps are you hearing. A discussion thread on Apple's site suggests that 3 beeps is a sign of a bad memory bank. So maybe the connection is solid enough to display in About this Mac but "loose" enough for the MBP to see properly use the RAM? Trying to think of a better way to phrase that last bit.